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(No Model.)

A. B. BENEDICT.

MEANS FOR OPERATING GRINDING MACHINES.

No. 442,349. Patented Dec. 9, 1890.

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NlTED STATES PATENT OFFICE.

ALFRED l3. BENEDICT, OF BUFFALO, NEW YORK.

MEANS FOR OPERATING GRINDING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 442,349, dated December 9, 1890.

Application filed April 12, 1890. Serial No. 347,660. (No model.)

To all whom it may concern.-

Be it known that 1, ALFRED l3. BENEDICT,

a citizen of the United States, residing at Buf- Improvements in Means for Operating Grinding-Machines, of which the following is a specification.

My invention consists in certain improvements in means for operating machines for sharpening knives, small tools, or other purposes where a grinding-machine is required, and will be fully and clearly hereinafter described and claimed, reference being had to the accompanying drawings, in which- Figure l is a side elevation of the device complete, showing it attached to a table. Fig. 2 is an enlarged detached front elevation of the spring case or holder, showing the spring in its proper position therein. Fig. 3 is a front elevation of the device complete. Fig. 4 is an enlarged sectional elevation cutting in a central longitudinal direction through the spring-case and nearly through its hub or reduced portion and also through the wheelhub and clutch-case, and Fig. 5 is an enlarged front elevation of the clutch-case and clutch.

The object of my invention is to produce a simple, durable, and effective device adapted to be operated by the foot, so that both hands maybe used for holding the articles to be sharpened.

The frame for holding the grinding'whcel and operating mechanism consists of the two side pieces 1 and 2,the base 3, and the under projecting piece at, provided with a thumbscrew 5, by which it is secured to a table, substantially as shown in Fig. 1 at 6, representing a portion of a table to which it is attached. This frame portion is provided with the usual vertically-adjustable portion 7, upon which the articles to be sharpened are held in position to be ground. It is made adj ustahle by means of the set-screw 8, and is kept in a vertical position by means of the well-known vertical slideways.

The sides 1 and 2, the base 3, and under projecting portion l are all formed or cast in one piece, and are preferably made of castiron. In the frame portion 1 is a square hole 9, into which the square end (shown in Fig. 4.) of the shaft 11 is fitted, so that it cannot spring-case forms one side of the spool, and p the washer 15 the other side. From the spoolbarrel 1% is another reduced portion 16, having a shoulder against which the washer 15 rests,

. as shown in. Fig. 4:. At the end of the reduced portion 10 is rigidly secured the clutch cam 17. This springcase and connecting portions are mounted on the shaft 11, so as to turn easily thereon.

On the reduced portion 16 is mounted the emery-wheel hub 18, (see Fig. 4,) the camclutch case 23 forming a portion of it. The arms 20 form a part of and project from the hub 18 to and form a portion of the emerywheel rim 21. (See Fig. 1.) 22 represents the emery portion of the same.

To one side of the hub 18 and forming a part of it is the clutch-case 23, in which the clutch-cam 17 operates. This clutch-cam is provided with two angular recesses 2-1, into which the rollers are placed. They are kept from coming out by the annular inwardly-projecting flange 26. (See Figs. 4. and 5.) From this construction it will be seen that a movement of the clutch-cam 17 in the direction of the arrow 1* will allow the cam to turn easily without turning the canrcase 23; but a movement in the opposite direction or in the direction of the arrow 20 will cause the rollers 25 to wedge or bind between the portions at of the clutch-cam and the sides e of the cam-case, so that the cam-case will turn with it in the direction of the arrow 10 and be instantly released the moment the movement of the cam-clutch is reversed.

Vithin the spring-case 13 is a coil-spring 27, having one end secured to the case at or about the point 28, (see Fig. 2,) the opposite end of the spring being connected by a pin 29 to the shaft 11.

To the spool portion 14 of the spring-case is attached by means of a screw a strap 31, of leather or other suitable material, having at its free end a stirrup 32, adapted to receive the foot of the operator. This strap 31 is wound around the spool several times, and is made long enough so that when the device is attached to a table the stirrup can be conveniently reached and operated by the foot. From this construction it will be seen that a pressure of the foot on the stirrup downward will unwind or partly unwind the strap 31, and in doing so it will cause the clutch to engage with the clutch-case, and thereby give a rotary motion to the emery or grinding wheel. This movementpartlyWindsuptheooil-spring, and the moment the stirrup is released it will turn the spring-case and spool, and thus wind up again the portion of the strap that has been unwound by the downward movement. During the upward movement of the stirrup the clutch m echanism is instantly released, so that the emery-wheel by its momentum continues its movement and another downward moveinent will give it a fresh start, thereby keepon a stationary shaft, and carrying a coilspring having one end secured to the shaft and the other end secured to the case,a strap connected with the hub of the case, having an operating-stirrup at its free end, a rollerclutch rigidly connected to the opposite end of the hub or sleeve, a grinding Wheel mounted loosely on said hub, provided with a cam-case, and cam-rollers located with the cam within the cam-case, substantially as and for the purposes described.

2. The combination, with a holding-frame, of a spring-case provided with a hub or sleeve carrying a roller-clutch at one end and the 

